Add intl support with test + remove windows build

[genevieve]

Context

We want internationalization support provided by V8 by default.

Changes

• The mac + ubuntu binaries have been updated with ICU enabled and the tests pass.
• The windows binary build + test CI parts have been commented out. We can't build the windows binary with ICU enabled because of a dependency. There are more details below, but I believe, for now, we can have our fork build only ubuntu/mac until we have support for building the windows binary described here

Old Windows Notes

• The windows binary has yet to be built but it needs python2 to run the icu assemble script and it needs the __init__.py files in all directories of the path for v8.build.util.lastchange to be imported into our build script.

If we do not want to embed ICU data into the v8 binary, we can revert the windows python2 stuff but we then need to figure out how to get the path to the v8 executable from v8go.cc so we can run the v8 function InitializeICUDefaultLocation(v8-exec-path) which will initialize icu and find the icu data file next to wherever the executable is located.